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Homework Statement
A wagon with mass M can move on frictionless surface. A mathematical/ideal pendulum is fastened on the wagon. At the initial moment the wagon and the pendulum were at rest and the pendulum makes an angle of x with the vertical. What will be the velocity of the wagon when the pendulum makes an angle of y with the vertical?
Homework Equations
I guess its a linear momentum question but I don't know the equation.